Zephyr, now known as Z, rides the seas with only one goal: Destroy all pirates and their dreams at becoming King of Pirates. When Luffy and his crew encounter him at sea, not only are they utterly defeated by the man with an arm made of Seastone, Nami, Robin, and Chopper are turned 10 years younger due to Z's minion Ain. Luffy is so determined to win against him that he does not even notice Z's master plan that could sacrifice thousands of lives.

After Nami steals the Going Merry, Roronoa Zoro, Usopp, and later Monkey D. Luffy and Sanji (along with Johnny and Yosaku) set after her and wind up in Cocoyasi Village, Nami's hometown ruled by the tyrannical fishman Arlong. It is here that Nami's past and true motives come to light.

One Piece 3D: Straw Hat Chase is the 11th One Piece film of the series, and is set before the time-skip. This is One Piece's first movie release to be in 3D CGI. The movie is also the first One Piece film since Movie 3 to be a double-feature. This time, the film was featured with "Toriko 3D: Gourmet Adventure", both being billed as the "Jump Heroes Film". The double-feature was released on March 19, 2011.